Telephone-transmitter.



Patented )une 5. |900.

J. M. MOORE. A TELEPHONE TRANSMITTER.

(Application led Sept. 23, 1899.)

(No Model.)

A TTOH/VEYS W/ TNE SSE S NTTED STATES PATENT Error..

JOSEPH M. MOORE, OE OHATHAM, iLLINOIs.

'TELEPHONE-TRANSMITTER.

SPECIFICATION formingpart of Letters Patent No. 651,198, dated June 5,1900.

Application filed September 23, 1899. Serial No. 731,436. (No model.)

T0 @ZZ whom t may concern:

Be it known that I, JOSEPH M. MOORE, of Chatham, in the county ofSangamon and State of Illinois, have invented a new and ImprovedTelephone-Transmitter, of which the following is' a full, clear, andexact description.

This invention relates to improvementsl in transmitters for electrictelephones; and the object is to provide a transmitter of suitableconstruction and very sensitive and uniform in its operation.

I will describe a telephone-transmitter eina bodying my invention andthen point out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters Ofreference indicatecorresponding parts in all the figures.

Figure 1 is an elevation of a transmitter embodying my invention. Fig. 2is a section on the line 2 2 of Fig. 1. Fig. 3 isasectio'nal detailshowing the carbon tubes and balls connecting Opposite electrodes, andFigs. 4 and 5 are respectively a sectional side elevation and a frontelevation Ot' a modification. Referring to the drawings, l designatesthe front board of the transmitter, 'and secured to the rear sidethereof is the diaphragm 2. The diaphragm is secured in place by meansof a ring 3 extending around its edge, through which screws 4 pass intothe front board, and arranged on the back of the diaphragm is a textilematerial 5-f-such,for instance, as feltdesigned to damp excessivevibration of the diaphragm. This textile material is held in place bymeans of a plate 6 at the center of the diaphragm and through which afastening-screw 7 passes, the said screw also passing through thediaphragm.

Mounted rearward of the diaphragm are two pairs of electrodes 8 9 and 10l1. Fastening-bolts 12 pass through the head portions of theseelectrodes and also through a central strip 13 Of insulating material,and the electrodes are suspended from a bolt 13, extended rearward fromthe front board 1 by means of spring-plates 14 15, connecting,respectively, with the binding-posts 16 17, to which the line-wires aredesigned to be connected. The electrodes S and 9 are connected by atubular bridge 18 of carbon, and placed within said tubular bridge is aseries of carbon balls 19, designed to increase the number of loosecontacts. The electrodes l0 and 11 are also connected together by atubular bridge 2O of carbon, within which carbon balls 2l are placed.The electrodes extend into the ends of the tubular bridges, and, asplainly indicated in Fig. 3, the openings within the bridges are taperedfrom the center outwardthat is, the Outer ends are larger in diameterthan the inner ends or central portion. rlhis is to cause the balls toroll outward to engage against the beveled ends of the electrodes foryielding pressure. The pressure of the tubes 18 and 20 against theelectrodes and also against thediaphragm is regulated by turning theweight 22 on the screw 23, extended from the lower end Of apressure-pendant 24, which is adjustably attached to a screw-rod 25,extended rearward in the front plate 1. It is to be understood that thenormal set of the inner tube 2O is slightly away from the diaphragm orrather slightly away from the end of the screw 7.

In Figs. 4 and 5 I have shown but two electrodes 26 27. These aremounted on springs 14, like the example first described, and in thisinstance the carbons are bridged by a bunch of platinum wire 2S,attached to the pendant 24.

A transmitter made in accordance with my invention may be used with twoor more cells of a battery and it is found very sensitive and powerful.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. In a telephone-transmitter, a diaphragm,electrodes rearward of the diaphragm, a spring-arm supporting theelectrodes, a

bridge between the electrodes, and a pres-4 sure-regulator rearward ofthe electrodes, substantially as specied.

2. A telephone-transmitter, comprising a diaphragm, electrodes rearwardof said diaphragm, spring-arms suspending said electrodes, a tubularbridge connecting the electrodes, and carbon balls in said bridge,substantially as specified.

3.V A telephone-transmitter,--comprising a IOS phragm, and electrodessuspended rearward of the diaphragm, substantially as specied.

5. A telephone-transmitter comprising a diaphragm, electrodes rearwardof the diaphragm, means for yieldingly supporting the electrodes, atubular bridge connecting the electrodes, and movable devices in thebridge, zo

substantially as specified.

JOSEPH M. MOORE.

Witnesses:

W. W. WHITLEY, I?. L. NOBLE.

